Process for separating a fluid component from a fluid mixture using microchannel process technology

• US 6,652,627 B1
• Filed: 10/30/2002
• Issued: 11/25/2003
• Est. Priority Date: 10/30/2002
• Status: Expired due to Term

• Current Assignee: Velocys Incorporated (Velocys PLC)
• Original Assignee: Velocys Incorporated (Velocys PLC)
• Inventors: Qiu, Dongming, Chadwell, G. Bradley, Schmidt, Matthew B., Burckle, Eric, Bruno, Wesley, Monzyk, Bruce F., Tonkovich, Anna Lee
• Primary Examiner(s): Spitzer, Robert H.
• Application Number:
  US10/284,029
• Time in Patent Office: 391 Days
• Field of Search: 95/96--06, 951/14, 951/15, 951/28--30, 951/35--41, 951/43, 951/44, 951/48, 961/26, 961/30, 961/31, 961/33, 961/43, 961/44, 961/46
• US Class Current: 95/104
• CPC Class Codes: B01D 2253/25 Coated, impregnated or composite adsorbents
• CPC Class Codes: B01D 2253/3425 Honeycomb shape
• CPC Class Codes: B01D 2259/40086 by using a purge gas B01D2259/4009 takes precedence
• CPC Class Codes: B01D 2259/40096 by using electrical resistance heating
• CPC Class Codes: B01D 2259/414 using different types of adsorbents
• CPC Class Codes: B01D 2259/655 using heat storage materials
• CPC Class Codes: B01D 53/0423 Beds in columns
• CPC Class Codes: B01D 53/0438 Cooling or heating systems
• CPC Class Codes: B01D 53/0462 Temperature swing adsorption
• CPC Class Codes: B01J 2219/00921 by absorption

Abstract

This invention relates to a process for separating a fluid component from a fluid mixture comprising the fluid component, the process comprising: (A) flowing the fluid mixture into a microchannel separator; the microchannel separator comprising a plurality of process microchannels containing a sorption medium, a header and a footer, the combined internal volume of the header and the footer being up to about 40% of the internal volume of the process microchannels; the fluid mixture being maintained in the microchannel separator until at least part of the fluid component is sorbed by the sorption medium; purging the microchannel separator to displace non-sorbed parts of the fluid mixture from the microchannel separator; and (B) desorbing the fluid component from the sorption medium and flowing a flush fluid through the microchannel separator to displace the desorbed fluid component from the microchannel separator. The process is suitable for purifying oxygen as well as effecting other fluid separations.

Claims

1. A process for separating a fluid component from a fluid mixture comprising the fluid component, the process comprising:

(A) flowing the fluid mixture into a microchannel separator;

the microchannel separator comprising a plurality of process microchannels containing a sorption medium, a header providing a flow passageway for fluid to enter the process microchannels, and a footer providing a flow passageway for fluid to leave the process microchannels, the combined internal volume of the header and the footer being up to about 40% of the internal volume of the process microchannels;

the fluid mixture being maintained in the microchannel separator until at least part of the fluid component is sorbed by the sorption medium;

purging the microchannel separator to displace non-sorbed parts of the fluid mixture from the microchannel separator; and

(B) desorbing the fluid component from the sorption medium and flowing a flush fluid through the microchannel separator to displace the desorbed fluid component from the microchannel separator.

2. The process of claim 1 wherein an inlet line is connected to the header and an outlet line is connected to the footer;

the inlet line having separate entries for the fluid mixture and the flush fluid, the entry for the flush fluid being upstream of the entry for the fluid mixture;

the outlet line having separate outlets for the fluid mixture and the flush fluid, the outlet for the flush fluid being upstream of the outlet for the fluid mixture.

3. The process of claim 1 wherein the header is comprised of a flexible member to permit changing the internal volume of the header.

4. The process of claim 1 wherein the footer is comprised of a flexible member to permit changing the internal volume of the footer.

5. The process of claim 1 wherein the header and the footer are each comprised of flexible members to permit changing the internal volume of the header and the footer.

6. The process of claim 1 wherein the header is a multiple entry header which comprises a fluid mixture section, a purging fluid section, and a flush fluid section;

the fluid mixture flows from the fluid mixture section into the process microchannels;

a purging fluid flows from the purging fluid section into the process microchannels; and

the flush fluid flows from the flush fluid section into the process microchannels.

7. The process of claim 1 wherein the flush fluid is different than the fluid component and the process further comprises separating the flush fluid from the fluid component.

8. The process of claim 1 wherein during step (B) the flush fluid flows from the header to the process microchannels, through the process microchannels to the footer.

9. The process of claim 1 wherein during step (B) the flush fluid flows from the footer to the process microchannels, through the process microchannels to the header.

10. The process of claim 1 wherein the process further comprises the step of regenerating the sorption medium subsequent to step (B).

11. The process of claim 1 wherein the sorption medium is at a first temperature during step (A) and a second temperature during step (B), the first temperature being lower than the second temperature.

12. The process of claim 1 wherein the sorption medium is at a first temperature during step (A) and a second temperature during step (B), the first temperature being higher than the second temperature.

13. The process of claim 1 wherein the sorption medium is at a first temperature at the beginning of step (A) and a second temperature at the end of step (A), the first temperature being higher than the second temperature.

14. The process of claim 1 wherein the sorption medium is under a first pressure during step (A) and under a second pressure during step (B), the first pressure being equal to or higher than the second pressure.

15. The process of claim 1 wherein the sorption medium is under a first pressure during step (A) and under a second pressure during step (B), the first pressure being equal to or lower than the second pressure.

16. The process of claim 1 wherein the sorption medium is at a first temperature and under a first pressure during step (A) and a second temperature and second pressure during step (B), the first temperature being lower than the second temperature, and the first pressure being equal to or higher than the second pressure.

17. The process of claim 1 wherein the sorption medium is at a first temperature and under a first pressure during step (A) and a second temperature and second pressure during step (B), the first temperature being lower than the second temperature, and the first pressure being equal to or lower than the second pressure.

18. The process of claim 1 wherein the sorption medium is heated using a resistance heater.

19. The process of claim 1 wherein the sorption medium comprises a metal structure that functions as a resistance heater.

20. The process of claim 1 wherein the sorption medium is heated using heat from heat exchange microchannels in thermal contact with the sorption medium.

21. The process of claim 20 wherein fluid flowing through the process microchannels flows in a first direction, and a heat exchange fluid flows through the heat exchange microchannels in a second direction, the second direction being cross current relative to the first direction.

22. The process of claim 20 wherein fluid flowing through the process microchannels flows in a first direction, and a heat exchange fluid flows through the heat exchange microchannels in a second direction, the second direction being cocurrent relative to the first direction.

23. The process of claim 20 wherein fluid flowing through the process microchannels flows in a first direction, and a heat exchange fluid flows through the heat exchange microchannels in a second direction, the second direction being counter current relative to the first direction.

24. The process of claim 20 wherein the heat exchange microchannels are made of a material comprising:

steel;

aluminum;

titanium;

nickel;

platinum;

rhodium;

copper;

chromium;

brass;

an alloy of any of the foregoing metals;

a polymer;

ceramics;

glass;

a composite comprising polymer and fiberglass;

quartz;

silicon;

or a combination of two or more thereof.

25. The process of claim 20 wherein the heat exchange microchannels have an internal dimension of width or height of up to about 2 mm.

26. The process of claim 1 wherein the process microchannels are made of a material comprising:

steel;

aluminum;

titanium;

nickel;

platinum;

rhodium;

copper;

chromium;

brass;

an alloy of any of the foregoing metals;

a polymer;

ceramics;

glass;

a composite comprising a polymer and fiberglass;

quartz;

silicon;

or a combination of two or more thereof.

27. The process of claim 1 wherein the sorption medium is in the form of a flow-by sorption medium.

28. The process of claim 1 wherein the sorption medium is in the form of a flow-through sorption medium.

29. The process of claim 1 wherein the process microchannels have interior surfaces and the sorption medium is coated on the interior surfaces of the process microchannels.

30. The process of claim 1 wherein the sorption medium is in the form of particulate solids.

31. The process of claim 1 wherein the sorption medium is in the form of particulate solids which are mixed with an effective amount of heat conductive particulate solids to increase the thermal conductivity of the sorption medium.

32. The process of claim 1 wherein the sorption medium is in the form of a foam, felt, wad, gauze, honeycomb, insertable fin, or a combination of two or more thereof.

33. The process of claim 32 wherein the foam, felt, wad, gauze or insertable fin functions as a resistance heater.

34. The process of claim 1 wherein the sorption medium has a serpentine configuration.

35. The process of claim 1 wherein the sorption medium is in the form of a flow-by structure with an adjacent gap, a foam with an adjacent gap, a fin structure with gaps, a washcoat on an inserted substrate, or a gauze that is parallel to the flow direction with a corresponding gap for flow.

36. The process of claim 1 wherein the sorption medium occupies about 1 to about 99 percent of the cross sectional area of at least one cross section of the process microchannel.

37. The process of claim 1 wherein the sorption medium comprises silver, gold, platinum, palladium, nickel, zeolite, silica gel, or a combination of two or more thereof.

38. The process of claim 1 wherein the sorption medium is derived from Fe(II), Co(II), Cu(I), V(II), Mn(II), Mn(III), Cr(II), Ag(I), Rh(I), Rh(II), Rh(III), U(IV), V(IV), Ru(II), Ru(IV), Ti(III), Cr(IV), Bi(III), Ni(II), W(V), W(IV), Mo(II), Mo(III), Mo(IV), Mo(V), Mo(VI), or a combination of two or more thereof.

39. The process of claim 1 wherein the sorption medium is derived from:

dipyridyl;

2,6-[1-(2-imidazol4-ylethylimino) ethyl pyridine];

cyclen;

cyclam;

a Schiff base ligand;

acetyl acetonate or an oligomer or polymer thereof;

a carboxylate;

bipyridyl or an oligomer or polymer thereof;

a porphyrin or an oligomer or polymer thereof;

a corin or an oligomer or polymer thereof;

a polyamide;

a protein;

8-hydroxy quinoline or an oligomer or polymer thereof;

ethyl cysteinate or an oligomer or polymer thereof;

an N-alkyl alkanohydroxamic acid;

dimethylglyoxime;

sym-diethylethylenediamine;

or a combination of two or more thereof.

40. The process of claim 1 wherein the sorption medium is derived from an imidazole, histidine amino acid, pyridine, piperidine, 4-methyl aminopyridine, 4-dimethyl aminopyridine, a nitrate, a thiocyanate, a halide, or a combination of two or more thereof.

41. The process of claim 1 wherein the sorption medium comprises:

hemoglobin;

hemoerythyrin;

hemocyanin;

myoglobin;

Co(II) (acacen);

Co(II) (dry cave) (N-methyl imidazole);

Fe(II) (H2TpivPP)B;

Fe(II)(capped porphyrin)B;

Fe(ophen)₂²⁺;

bis(ethyl cysteinato) oxovanadium (IV);

Cu(I) (bimp);

bis(dimethylglyoximato)cobalt(II);

bis(histidine)cobalt(II);

dinitrato-bis(sym-diethylethylenediamine)cobalt(II);

dichloro-bis(sym-diethylethylenediamine)cobalt(II);

[m-tetra(a, (α

,α

,α

,α

-o-pivalamidophenyl)porphyrin]cobalt(II);

[N,N-bis(salicylidene)dipropylenetriamine]cobalt(II);

[2,3,10,11,13,19-hexamethyl-3,10,14,18,21,25-hexaazabicyclo[10.7.7]hexacosa-1,11,13,18,20,25-hexene-κ

<sup>−

4</sup>N)cobalt(II)hexafluorophosphate;

[N,N′

-bis(salicylicylidene) ethylenediamine]cobalt(II);

[N,N′

-bis(3-methoxysalicylicylidene)ethylenediamine]cobalt(II);

[N,N′

-bis(salicylicylidene)tetramethylethylenediamine]cobalt(II);

[N,N′

-bis(3-methoxysalicylicylidene)tetramethylethylenediamine]cobalt(II);

[N,N′

-bis(3-isoprpoxysalicylicylidene)tetramethylethylenediamine]cobalt(II);

[N,N′

-bis(3-ethoxysalicylicylidene)tetramethylethylenediamine]cobalt(II);

[N,N′

-bis(5-methoxysalicylicylidene)tetramethylethylenediamine]cobalt(II);

[N,N′

-bis(5-n-butoxysalicylicylidene)tetramethylethylenediamine]cobalt(II);

[N,N′

-bis(salicylidene)ethylenediamine]cobalt(II));

a cobalt (II) porphyrin complex;

a metal-cyanide complex encapsulated within a zeolite;

a cyanocobaltate;

hemoglobin, hemerythrin or hemocyanin containing a diiron(III,IV), dicopper(II) or dimanganese core;

N,N′

-disalicylideneethylenediamine cobalt(II);

cobalt di-(3-methoxysalicylal tertbutylamine);

[N,N′

-bis(salicylidene)n-propyldipropylenetriamine]cobalt(II);

1-methylimidazole;

2-methylimidazole;

4-dimethylaminopyridine;

cyanopyridine;

cobalt chelated copolymer derived from ethylene-diamine-tetraacetic acid, methyl methacrylate and butyl acrylate;

bis(histidine) cobalt(II);

[α

-mono(o-methacrylamidophenyl)-α

,α

,α

-tris(o-pivalamidophenyl)porphinato]cobalt;

[meso-α

,α

,α

,α

-tetrakis(o-pivalamidophenyl)porphinato]-iron(II);

cobalt(II) meso-tetra-phenyl-porphyrin;

cobalt(II) meso-tetrakis(2-chlorophenyl) prophyrin;

cobalt(II) meso-tetrakis(4-chlorophenyl) porphyrin;

cobalt(II) meso-tetrakis(4-methoxy phenyl) porphyrin;

cobalt(II) meso-tetrakis(2,4-dimethoxy phenyl) porphyrin;

ruthenium (III) bis(salicylaldehyde)ethylenediimine;

ruthenium (III) bis(salicylaldehyde)diethlenetriimine;

ruthenium (III) bis(picolinaldehyde)-o-phenylenediimine;

ruthenium (III) bis(picolinaldehyde)ethylenediimine;

ruthenium (II) bis(picolinaldehyde)diethylenetriimine;

bis(dimethylglyoximato)nickel(II);

bis(dimethylglyoximato)cobalt(II);

bis(dimethylglyoximato)copper(II);

dinitrato-bis(sym-diethylenediamine)cobalt(II);

dithiocyanato-bis(sym-diethylethelenediamine)cobalt(II);

dichloro-bis(sym-diethylethylenediamine)cobalt(II);

cobalt di-(salicylal)-3,3′

-diimino-di-n-propylamine;

N,N′

-disalicyclidene ethylene diamine cobalt (II);

N,N′

-ethylene-bis(5-nitro-salicyliden-iminato) cobalt(II), or a combination of two or more thereof.

42. The process of claim 1 wherein the sorption medium is derived from a ligand having the structure illustrated in FIG. 16 wherein each R represents a hydrocarbon or substituted hydrocarbon group.

43. The process of claim 1 wherein the sorption medium comprises Sb₂O₅, AgO, PtO, CrO₂, PbO, HgO, Cu₂O, MnO, Mn₂O₃, Bi₂O₄, NiO, NiO₂, Cu₂O₃, SnO, SnO₂, WO₂, WO₃, W₂O₅, perfluorinated film, Pt/γ

-alumina, Fe/γ

-alumina, Cu/γ

-alumina, Zn/γ

-alumina, Co/γ

-alumina, zeolite, or a combination of two or more thereof.

44. The process of claim 1 wherein the sorption medium comprises a metal cyanide oligomer or polymer.

45. The process of claim 44 wherein the metal cyanide oligomer or polymer is represented by the formula [Cu(I)(CN)_x]_n, [Fe(ii)(CN)_y]_n or [Co(II)(CN)_y]_n, wherein x is 3, y is 5 and n is a number that is at least 2.

46. The process of claim 1 wherein the sorption medium comprises silica gel, foamed copper, sintered stainless steel fiber, alumina, poly(methyl methacrylate), polysulfonate, poly(tetrafluoroethylene), iron, nickel sponge, nylon, polyvinylidene difluoride, polypropylene, polyethylene, polyethylene ethylketone, polyvinyl alcohol, polyvinyl acetate, polyacrylate, polymethylmethacrylate, polystyrene, polyphenylene sulfide, polysulfone, polybutylene, or a combination of two or more thereof.

47. The process of claim 1 wherein the sorption comprises an antioxidant.

48. The process of claim 47 wherein the antioxidant comprises a secondary amine, phenolic phosphate, phosphite, phenolic, bisphenolic, hydroxylamine, olefinic carboxylate, amino carboxylate, tocopherol, di-tertiarybutyl-p-cresol, stannous salt, stannous oxide, sorbate, polysorbate, or a combination of two or more thereof.

49. The process of claim 1 wherein the sorption medium comprises a deposit derived from methane and hydrogen.

50. The process of claim 1 wherein the process microchannels have an internal dimension of width or height of up to about 10 mm.

51. The process of claim 1 wherein the fluid mixture in step (A) is non-condensed, at least about 1% by volume of the fluid component sorbed during step (A) is desorbed during step (B), the time to complete steps (A) and (B) being up to about 100 seconds.

52. The process of claim 1 wherein the fluid mixture in step (A) is condensed, at least about 10% by volume of the fluid component sorbed during step (A) is desorbed during step (B), the time to complete steps (A) and (B) being up to about 100 seconds.

53. The process of claim 1 wherein the sorption medium is at a temperature in the range of about −

100 to about 200°

C. during step (A), and about 0 to about 300°

C. during step (B).

54. The process of claim 1 wherein the sorption medium is under a pressure in the range of about 0.01 to about 50 atmospheres during step (A), and about 0.001 to about 50 atmospheres during step (B).

55. The process of claim 1 wherein the fluid mixture comprises air and the fluid component comprises oxygen.

56. The process of claim 1 wherein the fluid mixture comprises a paraffin and an olefin, and the fluid component comprises the olefin.

57. The process of claim 1 wherein the fluid mixture comprises ethylene and ethane, and the fluid component comprises ethylene.

58. The process of claim 1 wherein the fluid component comprises oxygen, hydrogen, NO_x, CO, CO₂, H₂S, HCN, SO₂, CH₃SCH₃, an olefin, a paraffin, an aromatic compound, a halogenated compound, a nitrate, a sulfate, a sugar, an ester, an alcohol, an ether, or a mixture of two or more thereof.

59. The process of claim 1 wherein the purging fluid comprises nitrogen, helium, argon, carbon dioxide, water vapor, or a mixture of two or more thereof.

60. The process of claim 1 wherein the flush fluid comprises nitrogen, helium, argon, carbon dioxide, water vapor, or a mixture of two or more thereof.

61. A process for separating oxygen from air comprising:

(A) flowing the air into a microchannel separator;

the microchannel separator comprising a plurality of process microchannels containing a sorption medium, a header providing a flow passageway for fluid to enter the process microchannels, and a footer providing a flow passageway for fluid to leave the process microchannels, the combined internal volume of the header and the footer being up to about 40% of the internal volume of the process microchannels;

the air being maintained in the microchannels separator until at least part of the oxygen is sorbed by the sorption medium;

purging the microchannel separator to displace non-sorbed parts of the air from the microchannel separator; and

(B) desorbing oxygen from the sorption medium and flowing a flush fluid through the microchannel separator to displace the desorbed oxygen from the microchannel separator.

62. A process for separating a fluid component from a fluid mixture comprising the fluid component, the process comprising:

(I)(A) flowing part of the fluid mixture into a first microchannel separator;

the first microchannel separator comprising a plurality of first process microchannels containing a first sorption medium, a first header providing a flow passageway for fluid to enter the first process microchannels, and a first footer providing a flow passageway for fluid to leave the first process microchannels, the combined internal volume of the first header and the first footer being up to about 40% of the internal volume of the first process microchannels;

the fluid mixture being maintained in the first microchannel separator until at least part of the fluid component is sorbed by the first sorption medium;

purging the first microchannel separator to displace non-sorbed parts of the fluid mixture from the first microchannel separator;

(I)(B) desorbing the fluid component from the first sorption medium and flowing a first flush fluid through the first microchannel separator to displace the desorbed fluid component from the first microchannel separator;

(II)(A) flowing another part of the fluid mixture into a second microchannel separator;

the second microchannel separator comprising a plurality of second process microchannels containing a second sorption medium, a second header providing a flow passageway for fluid to enter the second process microchannels, and a second footer providing a flow passageway for fluid to leave the second process microchannels, the combined internal volume of the second header and the second footer being up to about 40% of the internal volume of the second process microchannels;

the fluid mixture being maintained in the second microchannel separator until at least part of the fluid component is sorbed by the second sorption medium;

purging the second microchannel separator to displace non-sorbed parts of the fluid mixture from the second microchannel separator; and

(II)(B) desorbing the fluid component from the second sorption medium and flowing a second flush fluid through the second microchannel separator to displace the desorbed fluid component from the second microchannel separator.

63. The process of claim 62 wherein step (I)(A) is conducted at the same time that step (II)(B) is conducted.

64. The process of claim 62 wherein step (I)(B) is conducted at the same time that step (II)(A) is conducted.

65. A process for separating a first fluid component from a second fluid component, the first fluid component and the second fluid component being contained in a first fluid mixture, the process comprising:

(I) mixing the first fluid mixture with a third fluid component to form a second fluid mixture;

(II) separating the second fluid mixture into a third fluid mixture and a fourth fluid mixture, the third fluid mixture comprising the first fluid component and the third fluid component, the fourth fluid mixture comprising the second fluid component and the third fluid component;

(III)(A) flowing the third fluid mixture into a first microchannel separator;

the first microchannel separator comprising a plurality of first process microchannels containing a first sorption medium, a first header providing a flow passageway for fluid to enter the first process microchannels, and a first footer providing a flow passageway for fluid to leave the first process microchannels, the combined internal volume of the first header and the first footer being up to about 40% of the internal volume of the first process microchannels;

the third fluid mixture being maintained in the first microchannel separator until at least part of the first fluid component is sorbed by the first sorption medium;

purging the first microchannel separator to displace non-sorbed parts of the third fluid mixture from the first microchannel separator;

(III)(B) desorbing the first fluid component from the first sorption medium and flowing a first flush fluid through the first microchannel separator to displace the desorbed first fluid component from the first microchannel separator;

(IV)(A) flowing the fourth fluid mixture into a second microchannel separator;

the second microchannel separator comprising a plurality of second process microchannels containing a second sorption medium, a second header providing a flow passageway for fluid to enter the second process microchannels, and a second footer providing a flow passageway for fluid to leave the second process microchannels, the combined internal volume of the second header and the second footer being up to about 40% of the internal volume of the second process microchannels;

the fourth fluid mixture being maintained in the second microchannel separator until at least part of the second fluid component is sorbed by the second sorption medium;

purging the second microchannel separator to displace non-sorbed parts of the fourth fluid mixture from the second microchannel separator; and

(IV)(B) desorbing the second fluid component from the second sorption medium and flowing a second flush fluid through the second microchannel separator to displace the desorbed second fluid component from the second microchannel separator.

66. The process of claim 65 wherein the first fluid component comprises an olefin and the second fluid component comprises a paraffin.

67. The process of claim 65 wherein the first fluid component comprises ethylene and the second fluid component comprises ethane.

68. A process for separating a fluid component from a fluid mixture comprising the fluid component, the process comprising:

(I)(A) flowing the fluid mixture into a first microchannel separator;

the first microchannel separator comprising a plurality of first process microchannels containing a first sorption medium, a first header providing a flow passageway for fluid to enter the first process microchannels, and a first footer providing a flow passageway for fluid to leave the first process microchannels, the combined internal volume of the first header and the first footer being up to about 40% of the internal volume of the first process microchannels;

the fluid mixture being maintained in the first microchannel separator until at least part of the fluid component is sorbed by the first sorption medium;

removing non-sorbed parts of the fluid mixture from the first microchannel separator;

(I)(B) desorbing the fluid component from the first sorption medium and flowing a first flush fluid through the first microchannel separator to displace the desorbed fluid component from the first microchannel separator;

(II)(A) flowing the non-sorbed part of the fluid mixture removed from the first microchannel separator during step (I)(A) into a second microchannel separator;

the second microchannel separator comprising a plurality of second process microchannels containing a second sorption medium, a second header providing a flow passageway for fluid to enter the second process microchannels, and a second footer providing a flow passageway for fluid to leave the second process microchannels, the combined internal volume of the second header and the second footer being up to about 40% of the internal volume of the second process microchannels;

the non-sorbed part of the fluid mixture being maintained in the second microchannel separator until at least part of the fluid component is sorbed by the second sorption medium;

purging the second microchannel separator to displace non-sorbed parts of the fluid mixture from the second microchannel separator; and

(II)(B) desorbing the fluid component from the second sorption medium and flowing a second flush fluid through the second microchannel separator to displace the desorbed fluid component from the second microchannel separator.